https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.7 2026-04-15T10:53:30.610Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/2f4ccb5c-7b99-442c-9054-964070d95f7b VOLCANIC DEPOSITS Date=2024-10-25 User Id=tstevens Entity=WeightedRelation Operation=INSERT System Note=insert WeightedRelation New Value=id: null related concept uuid: 52325c6e-1084-43c1-83b2-278bbe0201c6 relationship type: null relationship value: null generated by: null Date=2024-10-25 User Id=tstevens Entity=Definition Operation=UPDATE Field=reference System Note=update Definition Old Value=GISP2 (Greenland) Ice cores and Climate Change: http://www.gisp2.sr.unh.edu/GISP2/MoreInfo/Ice_Cores_Past.html New Value=GISP2 (Greenland) Ice cores and Climate Change: http://www.gisp2.sr.unh.edu/GISP2/MoreInfo/Ice_Cores_Past.html Date=2024-10-25 User Id=tstevens Entity=Definition Operation=UPDATE Field=text System Note=update Definition Old Value=Volcanic deposits (including volcanic ash, debris, etc.) are found within ice core records. Volcanoes can produce large quantities of particles and leave a record in the ice. Scanning electron micrographs of the particles from a particularly large dust peak in an ice core may reveal that it is from a known volcano and allow a firm date to be placed on that section of core. For prehistoric times, the dust record is a key tool for reconstructing a history of volcanic activity. New Value=Volcanic deposits (including volcanic ash, debris, etc.) are found within ice core records. Volcanoes can produce large quantities of particles and leave a record in the ice. Scanning electron micrographs of the particles from a particularly large dust peak in an ice core may reveal that it is from a known volcano and allow a firm date to be placed on that section of core. For prehistoric times, the dust record is a key tool for reconstructing a history of volcanic activity. Date=2024-10-25 User Id=tstevens Entity=WeightedRelation Operation=INSERT System Note=insert WeightedRelation New Value=id: null related concept uuid: c736e45d-63f2-428b-abae-48f79d007703 relationship type: null relationship value: null generated by: null Date=2024-10-25 User Id=tstevens Entity=WeightedRelation Operation=INSERT System Note=insert WeightedRelation New Value=id: null related concept uuid: 9761565c-2126-49cd-b4c4-cd3bcb5dbbde relationship type: null relationship value: null generated by: null Volcanic deposits (including volcanic ash, debris, etc.) are found within icecorerecords. Volcanoes can produce large quantities of particles and leave a recordin the ice. Scanning electron micrographs of the particles from a particularlylarge dust peak in an ice core may reveal that it is from a known volcano andallow a firm date to be placed on that section of core. For prehistoric times,the dust record is a key tool for reconstructing a history of volcanicactivity. 2024-10-25 09:53:09.0